[SVG] SVGLength{,List} migration to new SVG property impl.

Source/core/svg/SVGLineElement.h

Index: Source/core/svg/SVGLineElement.h
diff --git a/Source/core/svg/SVGLineElement.h b/Source/core/svg/SVGLineElement.h
index 68b961afa8da5bc5db662b5584ce131327b78496..c81d6a01ff0d8aad7a72cba696b0279512309a74 100644
--- a/Source/core/svg/SVGLineElement.h
+++ b/Source/core/svg/SVGLineElement.h
@@ -34,6 +34,11 @@ class SVGLineElement FINAL : public SVGGeometryElement,
 public:
     static PassRefPtr<SVGLineElement> create(Document&);
 
+    SVGAnimatedLength* x1() const { return m_x1.get(); }
+    SVGAnimatedLength* y1() const { return m_y1.get(); }
+    SVGAnimatedLength* x2() const { return m_x2.get(); }
+    SVGAnimatedLength* y2() const { return m_y2.get(); }
+
 private:
     explicit SVGLineElement(Document&);
 
@@ -48,11 +53,11 @@ private:
 
     virtual bool selfHasRelativeLengths() const;
 
+    RefPtr<SVGAnimatedLength> m_x1;
+    RefPtr<SVGAnimatedLength> m_y1;
+    RefPtr<SVGAnimatedLength> m_x2;
+    RefPtr<SVGAnimatedLength> m_y2;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGLineElement)
-        DECLARE_ANIMATED_LENGTH(X1, x1)
-        DECLARE_ANIMATED_LENGTH(Y1, y1)
-        DECLARE_ANIMATED_LENGTH(X2, x2)
-        DECLARE_ANIMATED_LENGTH(Y2, y2)
         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 };